Woocommerce fail order send email

functions.php

<?php
/*
* Woocommerce send email to customer when order status is change to Failed
*/

add_action( 'woocommerce_order_status_failed', 'mysite_failed');
function mysite_failed($order_id) {

    error_log("$order_id set to FAILED", 0);
    $order = wc_get_order( $order_id );

    // User data
    $user_email = $order->get_billing_email();

    // From data
    $email = '[email protected]';
    $message = 'Fail order!';

    // To data
    $to = $user_email;
    $subject = "Fail Order";
    $headers = 'From: '. $email . "\r\n" .
        'Reply-To: ' . $email . "\r\n";

    // Send email
    $sent = wp_mail($to, $subject, strip_tags($message), $headers);
    if($sent){

    }// Message send
    else {

    }// Message not send

}
?>